Physics 6C Ch28worksheet

# Physics 6C Ch28worksheet - 5 An X-ray photon scatters from...

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PHYSICS 6C Ch.28 Worksheet clas.ucsb.edu/staff/vince/ 1) A flashlight emits 1.5W of power. Assuming a frequency of 5.2x10 14 Hz for the light, determine the number of photons given off per second. 2) The work function of gold is 4.58 eV. What frequency of light must be used to eject electrons from a gold surface with a maximum kinetic energy of 6.48x10 -19 J? Is this light visible to the human eye? 3) Find the energy of the photon required to excite a hydrogen atom from the n=2 state to the n=5 state. 4) An excited hydrogen atom could, in principle, have a radius of 1mm. What would be the value of n for a Bohr orbit of this size? What would the energy of the atom be?

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PHYSICS 6C Ch.28 Worksheet clas.ucsb.edu/staff/vince/
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Unformatted text preview: 5) An X-ray photon scatters from a free electron at rest at an angle of 175° relative to the incident direction. If the scattered photon has a wavelength of 0.32 nm, what is the wavelength of the incident photon? 6) What speed must a neutron have if its de Broglie wavelength is to be equal to the interionic spacing of table salt (0.282 nm)? 7) The uncertainty in position of a proton confined to the nucleus of an atom is roughly the diameter of the nucleus. If this diameter is 7.5x10-15 m, what is the uncertainty in the proton’s momentum? 8) The measurement of an electron’s energy requires a time of 10 ns. What is the smallest possible uncertainty in the electron’s energy?...
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Physics 6C Ch28worksheet - 5 An X-ray photon scatters from...

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